A method and device for managing an emergency procedure of an emergency transaction mode that can be activated in the event of a computer attack on or a failure of a transaction network. The method may be carried out by an electronic device suitable for performing a transaction in a normal mode or in the emergency mode. The method performs operations that may include receiving an activation command for activating the emergency mode procedure, where the command includes an identifier of the procedure and first encrypted data; verifying the activation command, which includes verifying the first encrypted data; and if verification of the command is successful, activating the emergency procedure.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The method according to claim 1, wherein the identifier of the emergency procedure is associated with a first value, and wherein the method further comprises verifying, by the electronic device, that the first value is greater than a second value of a procedure identifier stored in the electronic device.
11. The method according to claim 1, wherein verifying, by the electronic device, that the activation command is successful comprises verifying that said emergency procedure is not already activated by checking value of an emergency mode flag.
12. The method according to claim 1, further comprising generating, by the electronic device, the cryptogram by using a symmetrical cryptographic key dedicated to the emergency mode.
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June 6, 2019
May 2, 2023
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